You've worked so hard and so long to get this far. The exam is just one final hurdle. One final small hurdle--that's what it will look like when you're done. Then come the letters after your name. Then comes the increased job flexibility, maybe increased salary, and increased relief.
It's just one test. 170 questions, four hours...and it's over. But before you get to read PASS on your computer screen, you've got to answer a bunch of those questions correctly. Which involves three basic skills: understanding test-taking, managing jitters, and knowing the exam process and content. Below are links to help you get going on all three.
First, test-taking skills. You couldn't have come this far without some tests passed. Particularly multiple choice ones. Check out this collection of suggestions that should help you harness your past success and get you through this long, vexing test.
Managing test anxiety is really a test-taking skill. If you go in with your head full of worries and imagined catastrophes, good decision-making goes out the window. The web is full of test anxiety help like this. You're a social worker, so you know the drill. Sleep, exercise, and good nutrition are key. Identify your automatic negative thoughts, dispute them, repeat. If you need a CBT workbook or therapist to talk to, this is as good a time as ever to seek one out.
Learning exam process and content is, once you've got test-taking and anxiety management happening, really a piece of cake. Sitting down for full-length practice exams (like SWTP's) gives you a good sense of what it's like to get through X number of questions in Y number of hours. Do you start to nod off? Bring a power bar to the exam, plan breaks, etc. Practice tests help you plan all that out. Drive the route to the exam site, if you think that will help. Getting there is also part of the process.
Finally, there's exam content? Ah, content. Content gets too much attention. You can go on the ASWB website to see content outlines. But they'll likely just worry you. Think about it this way: What would you put on the exam if you were testing social workers? What might you reasonably expect MSWs to know as they're entering licensure? How to work with clients--that's the basic thing, right? What's that involve? You already know. You have to be able to use basic social work skills to build rapport, assess, treatment plan, diagnose, etc. You always have an eye out for safety issues, for scope of practice issues, for ethical challenges. That's the stuff that's on the exam. So go read up on all of that. Dig into the NASW Code of Ethics, the commonly-encountered diagnoses in the DSM. The basics. That's the content of the exam. If there's other material that shows up, it should only be a few questions--not enough to undermine your good understanding of the bulk of the questions on the exam.
So that's the trick. Make sure you're up-to-speed on test taking skills; manage your test anxiety; understand the exam process; learn some exam content. And soon enough, you'll be licensed. Nothing to it but to do it. Good luck!